4JJ1-TCX Diesel Injectors
Compatible with Isuzu D-Max (RT)
- OEM Tested & Calibrated
- 12-Month Warranty
- Free UK Delivery
Select the correct injector for your 4JJ1-TCX engine below
Fits Isuzu D-Max (RT) and more
Top injectors for 4JJ1-TCX
Compatible Injectors for 4JJ1-TCX
- OEM Tested
- 12-Month Warranty
- Free UK Delivery
Common problems solved by these injectors
About the 4JJ1-TCX engine
The 4JJ1-TCX is a 3.0l 4jj1-tc common rail diesel engine. This engine uses Denso diesel injectors.
How Diesel Injectors Are Remanufactured
Watch our 3D walkthrough of the diesel injector remanufacturing process and see how injectors are professionally restored for reliable service.
Vehicles Using 4JJ1-TCX Engine
| Vehicle | Engine | Years |
|---|---|---|
| Isuzu D-Max (RT) injector | 3.0 | 2007-2012 |
Common 4JJ1-TCX Injector Problems
Rough idle and engine vibration
Worn injector nozzles cause uneven fuel spray, leading to rough idle at low RPM. Most noticeable when the engine is cold.
Excessive exhaust smoke
Black or blue-grey smoke on acceleration indicates poor fuel atomisation. This is often caused by carbon buildup on the injector nozzle tip.
Poor fuel economy
A worn or leaking injector delivers incorrect fuel quantities, reducing efficiency by 10–20% in severe cases.
Engine misfire under load
Intermittent misfires during acceleration suggest one or more injectors are failing to deliver the correct fuel pressure.
Difficult cold starting
Degraded injector nozzles struggle to atomise fuel at lower cranking pressures, causing extended crank times in cold weather.
Loss of power
Gradual power loss across the rev range, particularly above 2500 RPM, can indicate injector flow rate degradation.
Increased diesel knock
Louder than normal combustion noise, especially at idle, can indicate incorrect injection timing due to worn injector internals.
4JJ1-TCX Technical Specifications
Displacement
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Power
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Torque
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Fuel System
Common Rail Direct Injection
The 4JJ1-TCX is a 3.0l 4jj1-tc common rail diesel engine. This engine uses Denso diesel injectors.
Engine Intelligence
Isuzu 3.0 DI-D (4JJ1-TC/TCX — D-Max, Rodeo, Colorado, NPR)
Documented failure modes
- Injector wear or internal leakage — balance/compensation values drift out of specification before major drivability symptoms appear
- Leaking injector diluting the engine oil (rising level, diesel smell in the sump)
- Injector back-leak dragging rail pressure down on high-mileage engines
Diagnostic guidance
- Read injector balance / compensation values — one cylinder far from the others identifies the failing unit early
- Check the engine oil for diesel dilution; a rising level points to a leaking injector on this engine
- Run an injector leak-back test on hard-start or P0087 complaints
- Denso injectors carry an ID code — register the new code after fitting
Fitment note: 4JJ1 variants (TC/TCX, DPF and non-DPF, by model year) use different Denso references — always match the reference etched on the injector body.
Related 4JJ1-TCX Engine Guides
Related Pages
Denso 3.0L 4JJ1-TC — browse compatible engines, vehicles, and injectors
Compatible Engines
Compatible Vehicles
Recommended Injector
095000-6980
Denso — View product page